Buoy 4558 



Buoy 4558 (Figure B-3) was 

 deployed at 1551Z on 30 April 

 (121) at 46-59N, 47-19W. On 21 

 June (173), after 53 days of drift, it 

 was recovered by NORTHWIND. 

 The drogue sensor accurately 

 reported that the drogue was 

 attached for the entire drift period. 



During the first 28 days (until 28 

 May, 149) following 4558's 

 deployment, it moved persistently 

 southward toward the Tail of the 

 Bank following the 1000 m isobath 

 at speeds of about 25 cm/s. Near 

 44-30N peak buoy speeds of 50- 

 60 cm/s were observed over short 

 intervals (<6 hours). Over most of 

 this 28 day period the surface 

 temperature increased slowly from 

 1 to 4°C (0.2°C/day). On 22 May 

 (143) the temperature increased 

 rapidly (0.2°C/hr) from 4-9°C. 



On 28 May (149) 4558 turned 

 northwestward, following the 200 

 m contour. On 10 June (162) it 

 began a persistent southward, off- 

 slope motion. The temperature 

 which had remained in the 8-1 1°C 

 range since the rapid increase on 

 22 May, increased from 1 1 to 

 14°C over a four day period 

 starting on 17 June (169). 



BUOY 4558 

 1988 



u 



CL 



3: 



CE 



18 

 16 

 14 

 12 

 10 

 8 

 B 

 4 

 2 

 

 -2 



in 

 \ 



u 



CL 



o 

 o 



I 



Z) 



123 



80 

 60 - 

 40 - 

 20 - 

 — , 



-20 



-40 



-S0 



I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I 



138 153 168 



YERR-DRY 



-80 



I I I 



\ 



z: 

 u 



Q. 



o 

 (J 

 I 

 > 



123 



80 p 



60 - 



40 - 



20 - 



— 



-20 -'" 



-40 - 



-60 - 



I I I M I I ] I I I I M I I I M ] I I ] I I ] I M I I ] ] I I ] I I J I I I I I I I ] I 



138 153 168 



YERR-DRY 



-80 



J_l 



123 



I I I I I I I I I I I I I I I I I I I M I I I I I I I I I I I I J I I I I I I I ] I I I I I I I I 



138 153 168 



YERR-DRY 



Figure B-3a. Time history of sea surface temperature, U, and V 

 velocity components (filtered) for 4558. 



68 



